Q149 / 180 · COMEDK 2017 · Physics

A tangent galvanometer has a reduction factor of $1 \mathrm{~A}$ and it is placed with the plane of its coil perpendicular to the magnetic meridian. The deflection produced when a current of $I A$ is passed through it is

  • A
    $60^{\circ}$
  • Correct answer
    B
    $45^{\circ}$
  • C
    $30^{\circ}$
  • D
    None of these

Solution

The deflection in a tangent galvanometer is given by $\tan \theta=\frac{I}{K}$ where, $K=$ reduction factor Here, $K=1 \mathrm{~A}, I=1 \mathrm{~A}$ $\therefore \quad \tan \theta=\frac{1}{1}=1 \Rightarrow \theta=45^{\circ}$

Hence, the correct answer is option: 'B'.

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